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Detailed Explanation of the Key Techniques for Bag-Removal and Color Change in Shiitake Mushrooms

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Bag-cultivated shiitake mushrooms often yield poorly, and one of the key reasons is that the bag-removal and color change technique is inadequate. Successful color change is shown by the fluffy mycelium lying flat and forming a thin, brown, glossy film. Failed color change is shown in the following ways: 1. The color change is too pale or uneven, with the mycelium appearing grayish-white or grayish-black. The cause is that after bag removal, the mushrooms encountered high temperatures above 28°C for several consecutive days, or the air temperature remained at a low temperature below 12°C, resulting in poor mycelial growth. The remedy is: when the temperature is too high, ventilate in the morning and evening; when the temperature is too

Bag-cultivated shiitake mushrooms often yield poorly, and one of the key reasons is that the bag-removal and color change technique is inadequate. Successful color change is shown by the fluffy mycelium lying flat and forming a thin, brown, glossy film. Failed color change is shown in the following ways:

1. The color change is too pale or uneven, with the mycelium appearing grayish-white or grayish-black. The cause is that after bag removal, the mushrooms encountered high temperatures above 28°C for several consecutive days, or the air temperature remained at a low temperature below 12°C, resulting in poor mycelial growth. The remedy is: when the temperature is too high, ventilate in the morning and evening; when the temperature is too low, pull back the shading material over the mushroom shed during the day to use sunlight to raise the temperature of the mushroom house, or take warming measures to keep the room temperature above 15°C.

2. Excessive mycelial growth: the causes and solutions are: ① Too much iron and urea added to the compost causes an imbalance in the carbon-to-nitrogen ratio. When mixing the compost, keep the carbon-to-nitrogen ratio at 20-30:1; ② The temperature of the mushroom bed is too high and the temperature difference is small. The mushroom bed temperature should be lowered and the temperature difference increased; ③ The colonization time is insufficient and the bags are removed too early. The colonization time should be appropriately extended so that colonization is sufficient and the bags are removed at the right time; ④ After bag removal, the mycelium takes too long to resume growth. The time for resuming growth after bag removal should be kept at 3-5 days; ⑤ After the mycelium becomes thick and white, ventilation is not carried out in time. As much as possible, uncover the film for 3-5 hours at noon on sunny days, strengthen ventilation so that the surface of the mushroom logs is dry and not sticky to the touch, then cover the film again to let it change color. If it still does not change color, spray 3% limewater, then cover the film well and it will change color.

3. Mycelial dehydration: the remedy is to spray water for several consecutive days to maintain moisture and lower the temperature, and ventilate for 30 minutes each day.

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